CN103219804B - Be applicable to the radio energy management instrument of energy managing and control system - Google Patents

Abstract

The invention discloses a wireless energy management instrument suitable for an energy management and control system. Connecting terminals are provided, and the circuit board is used to obtain information related to the voltage, current, power and power factor of the three-phase power line, and to calculate the load rate in real time, and at the same time, use the breakpoint resume method to realize the transmission of electric energy data; the indicator light It is used to receive the load rate level result output by the circuit board, and output the load rate level result in the form of an indicator light. The meter of the invention enables non-professionals to intuitively obtain the operating efficiency of the equipment, and the design of wireless breakpoint resume transmission facilitates the meter to be connected to the energy management information system.

Description

Wireless energy management instrumentation for energy management and control systems

technical field

The invention relates to the field of intelligent electric energy management systems, in particular to a wireless energy management instrument suitable for energy management and control systems.

Background technique

The power monitoring system is a goal of using modern network technology and computer technology to realize various management functions of the power system, improve the management efficiency of the power system, and ensure the reliable and safe operation of the power system. A typical power monitoring system consists of a power monitoring instrument, a communication network and a monitoring host. Among them, the power monitoring instrument is responsible for power metering (statistical power consumption) and real-time power parameter (current, voltage, power, power factor, etc.) monitoring, and then the monitoring information is transmitted to the monitoring host through the RS485 network or Ethernet. Real-time display, statistics and analysis of collected power parameters.

The power energy management and control system is a system that collects, reports, summarizes and analyzes electricity consumption information, and generates dynamic data curves and reports, so as to realize real-time and accurate dynamic supervision of the energy utilization status of enterprises, and help enterprises use energy scientifically. In order to achieve the purpose of energy saving. The difference between the power monitoring system and the power energy management and control system: the power monitoring system focuses on monitoring the safe and reliable operation of the power system itself. The power energy management and control system evolved from the power monitoring system, but it focuses more on power consumption statistics, energy-saving analysis, forecasting and management.

At present, general-purpose power monitoring instruments and smart meters are mainly designed for power metering and power parameter monitoring, and cannot fully meet the needs of energy management and control systems. From the point of view, the instrument cannot record the entire process of equipment power consumption, and cannot analyze the energy efficiency of equipment online. In terms of communication, power monitoring instruments generally use the wired communication method of RS485 interface. In some occasions where wiring conditions are not available, there is a lack of low-cost, convenient and fast wireless communication interface.

Contents of the invention

In order to solve the above technical problems and overcome the defects of the existing power monitoring instrument applied to the energy management and control system, the purpose of the present invention is to provide a wireless energy management instrument suitable for the energy management and control system, including a housing and a The circuit board is provided with an indicator light on the top of the housing, and terminals are provided on both sides of the housing. The circuit board is used to obtain information related to voltage, current, power and power factor, and to calculate the load in real time. rate, output the result of the load rate level in the form of an indicator light, and at the same time apply the breakpoint resume method to realize the wireless transmission of power data.

The load rating results include at least four levels.

The results of the load rate level include high, medium, low and low. When the monitored load is a transformer, the load rate level corresponds to an average load rate range of >75%, 60%-75%, 40%-60%, <40 %, when the monitored load is an asynchronous motor, the load rate level corresponds to an average load rate range of >70%, 60%-70%, 50%-60%, and <50%.

The resumed transmission method includes a master node and a secondary node connected to the master node, and includes the following implementation steps:

Step A: The secondary node regularly sends a heartbeat packet to the primary node to confirm the connection status with the primary node;

Step B: Before the secondary node reports the data, query the signal strength and connection status of the communication with the primary node, and judge whether the sending data condition is met according to the signal strength threshold. If not, cache the data and wait for the next sending. If the sending condition is met, then According to the length of the data to be sent, it is divided into multiple sub-packets, and the number and check field are added at the same time, and the sub-packets are sent in sequence;

Step C: The primary node receives the end flag frame sent by the secondary node, and returns a response signal according to the received flag;

Step D: The secondary node determines whether to end the data transmission or retransmit the corresponding numbered subpacket according to the response signal returned by the primary node.

The circuit board is provided with an analog signal processing circuit connected to the input signal end, a microprocessor circuit connected to the output end of the analog signal processing circuit, and a communication circuit electrically connected to the communication end of the microprocessor circuit. A fast circuit, a storage circuit electrically connected to the storage end of the microprocessor circuit, a real-time clock circuit and a power supply circuit electrically connected to the clock signal end of the microprocessor circuit; the microprocessor circuit is used for statistics and analysis to obtain The digital signal of the digital signal can calculate the corresponding power parameters, load rate level and other information in real time. The storage circuit is used to store the collected data and analysis results; the real-time clock circuit provides a clock for statistics and analysis, and adds time to the stored monitoring data. label information.

The communication circuit includes an RS485 interface communication circuit and a wireless communication circuit.

The indicator lights include a load rate indicator light, a power indicator light, a communication indicator light and an online indicator light.

The indicator light is a single-color LED light.

The wireless communication circuit is a 2.4GHz wireless communication circuit.

The wireless communication circuit includes nRF24L01 radio frequency chip.

The present invention has positive effects: in the present invention, non-professionals can intuitively obtain the operating efficiency of the equipment by using the meter of the present invention, and the wireless breakpoint resume design facilitates the meter to be connected to the energy management information system; and the strong current does not pass through the meter The terminal block reduces the size of the instrument to a certain extent, and simplifies the wiring for easy installation; it has RS485 and short-distance wireless communication interface and communication circuit, which is convenient for building an information system; it can measure voltage, current, power and power factor. It also has the function of real-time load rate monitoring, and can count and analyze the energy efficiency of equipment, classify the load rate and display it visually through the indicator light; it can store the collected data and analysis results in time for easy query.

Description of drawings

In order to make the content of the present invention more easily understood, the present invention will be described in further detail below according to specific embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is the block diagram of the circuit structure on the circuit board of the present invention;

Fig. 2 is a simplified schematic diagram of the side and terminals of the housing of the present invention;

Figure 3 is a schematic front view of the housing of the present invention;

Fig. 4 is a wireless communication circuit diagram of the present invention;

FIG. 5 is a flow chart of the method for resuming transmission from breakpoints in the present invention.

Detailed ways

(Example 1)

Fig. 1 to Fig. 5 have shown a kind of embodiment of the present invention, and wherein Fig. 1 is the circuit structure block diagram on the circuit board of the present invention; Fig. 2 is the side and terminal simplified schematic diagram of housing of the present invention; Fig. 3 is this The front schematic view of the casing of the invention; FIG. 4 is a circuit diagram of the wireless communication of the present invention; FIG. 5 is a flow chart of the method for resumed transmission of the present invention.

Referring to Fig. 1 to Fig. 3, the wireless energy management instrument applicable to the energy management and control system of the present invention includes a housing 1 and a circuit board arranged in the housing 1, and an indicator light 2 is arranged on the upper surface of the housing 1 , connecting terminals 3 are arranged on both sides of the housing 1, an analog signal processing circuit 4 connected to the input signal end, a microprocessing circuit 4 connected to the output end of the analog signal processing circuit 4 are arranged on the circuit board The device circuit 5, the communication circuit 6 electrically connected to the communication terminal of the microprocessor circuit 5, the storage circuit 7 electrically connected to the storage terminal of the microprocessor circuit 5, and the clock signal of the microprocessor circuit 5 The real-time clock circuit 8 and the power supply circuit 9 are connected electrically. The communication circuit 6 includes an RS485 interface communication circuit 61 and a wireless communication circuit 62 . The indicator light 2 includes a load rate indicator light, a power indicator light, a communication indicator light and an online indicator light. The indicator light is a monochromatic LED light, and the wireless communication circuit is a 2.4GHz wireless communication circuit. The three-phase AC current signal line enters through the left hole of the shell and exits from the right side, and the three-phase AC voltage line and zero line are respectively connected to the terminal blocks (1, 2, 3 and 4 in the figure), and then processed by analog signals The circuit converts the input analog strong electric signal into a digital weak electric signal, and then enters statistics and analysis through the microprocessor circuit, and calculates the corresponding power parameters and load rate level in real time. The communication circuit provides a data communication interface for building an energy management information system , the storage circuit is used to store the collected data and analysis results, the real-time clock circuit provides a clock for statistics and analysis data, and adds time stamp information to the stored monitoring data at the same time.

The wireless energy management instrument in this embodiment divides the monitored loads into transformers, asynchronous motors and comprehensive loads;

When the load it monitors is a transformer class, the average load rate of the transformer is defined as: within a certain period of time, the ratio of the apparent power of the average output of the transformer and the rated capacity of the transformer, because the load rate in the present invention is divided into high, medium, relatively There are four different grades of low and low, and the corresponding average load rate ranges are >75%, 60%-75%, 40%-60%, <40%, and the average statistical period is 24 hours. And at the hour, the instrument outputs daily, monthly, and annual average load ratios sequentially through the communication interface and indicator lights.

When the load it monitors is an asynchronous motor, the motor load rate: the ratio of the actual output power of the motor to its rated power when the motor is working. Asynchronous motor is a kind of electromechanical equipment widely used in industrial production. Three-phase asynchronous motors are generally selected according to the condition of normal operation under the maximum load, but in actual operation, they are often under variable loads, even light loads or no loads. Running in the state of load will cause the power factor of the motor to become smaller, the efficiency will be reduced, and the electric energy will be wasted seriously. Therefore, the load rate of the asynchronous motor is monitored, counted and analyzed in real time, so as to guide the equipment to improve the operating efficiency and provide data support for the energy-saving transformation of the motor. The present invention calculates the load rate of asynchronous motors once per minute, and indicates the load rate level (high, medium, low, low) of the current monitoring load through the indicator light, and the corresponding average load rate ranges are> 70%, 60% %-70%, 50%-60%, <50%). At the same time, the instrument outputs the accurate value of the average load rate in minutes, hours, days, months, and years through the communication interface.

When the load it monitors is comprehensive, (comprehensive refers to all electrical equipment except transformers and asynchronous motors), it does not carry out load rate statistics, only current, voltage, power and power factor, etc. Three-phase power parameters are monitored.

See Figure 4 and Figure 5, the wireless communication circuit includes nRF24L01 radio frequency chip.

The wireless communication circuit completes the stable transmission of wireless data under the industrial environment by adding a breakpoint resume method. The breakpoint resume method includes a master node and a secondary node connected to the master node. Completing the communication includes the following steps:

Step A: The secondary node regularly sends a heartbeat packet to the primary node to confirm the connection status with the primary node;

Step B: Before the secondary node reports the data, query the signal strength and connection status of the communication with the primary node, and judge whether the sending data condition is met according to the signal strength threshold. If not, cache the data and wait for the next sending. If the sending condition is met, then According to the length of the data to be sent, it is divided into multiple sub-packets, and the number and check field are added at the same time, and the sub-packets are sent in sequence;

Step C: The primary node receives the end flag frame sent by the secondary node, and returns a response signal according to the flag frame;

Step D: The secondary node determines whether to end the data transmission or retransmit the corresponding numbered subpacket according to the response signal returned by the primary node.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or changes derived from the essential spirit of the present invention still belong to the protection scope of the present invention.

Claims (6)

1. one kind is applicable to the radio energy management instrument of energy managing and control system, comprise housing and be arranged on the circuit board in described housing, described housing be provided with indicator light just above, binding post is provided with in described housing both sides, it is characterized in that: described circuit board is for obtaining the voltage of three-phase power circuit, electric current, power and power factor relevant information, and real-time computational load rate, load factor level results is exported with the form of indicator light, apply breakpoint transmission method simultaneously and realize energy data Wireless transceiver, described load factor level results comprises at least four ranks, load factor level results comprises height, in, lower and low, when monitoring load is transformer, the corresponding Rate of average load scope of described load factor grade is > 75%, 60%-75%, 40%-60%, < 40%, when monitoring load is asynchronous machine, the corresponding Rate of average load scope of described load factor grade is > 70%, 60%-70%, 50%-60%, < 50%, the minor node that described breakpoint transmission method comprises host node and is connected with host node, and comprise following performing step:

Steps A: minor node timing sends heartbeat packet to host node, confirms the connection status with host node;

Step B: inquiry and host node communication signal strength and connection status before minor node reported data, and judge whether to possess transmission data qualification according to signal strength signal intensity threshold values, if do not possessed, data cached, wait for that next time sends, if possess transmission condition, then according to outgoing data length, split into multiple subdata bag, add numbering, check field, and order sends subdata bag successively simultaneously;

Step C: host node receives the end mark frame that minor node sends, and return answer signal according to the mark received;

Step D: the answer signal that minor node returns according to host node, determines whether the subdata bag of end data transmission or the reference numeral that retransfers; Described circuit board is provided with the analog signal processing circuit be connected with input signal end, the microcontroller circuit be connected with described analog signal processing circuit output, the communication circuit be electrically connected with described microcontroller circuit communication end, stores hold the memory circuit be electrically connected, the real time clock circuit be electrically connected with described microcontroller circuit clock signal terminal and power circuit with described microcontroller circuit; Described microcontroller circuit is used for the digital signal that statistics and analysis obtains, and calculates corresponding parameters of electric power, load factor grade in real time, and described memory circuit is used for storage of collected data and analysis result; Described real time clock circuit provides clock for statistics and analysis, is the Monitoring Data interpolation time scale information of preservation simultaneously.

2. the radio energy management instrument being applicable to energy managing and control system according to claim 1, is characterized in that: described communication circuit comprises RS485 interface communication circuitry and radio communication circuit.

3. the radio energy management instrument being applicable to energy managing and control system according to claim 2, is characterized in that: described indicator light comprises load factor indicator light, power supply indicator, communication indicator light and online indicator light.

4. the radio energy management instrument being applicable to energy managing and control system according to claim 3, is characterized in that: described indicator light is monochromatic LED lamp.

5. the radio energy management instrument being applicable to energy managing and control system according to claim 4, is characterized in that: described radio communication circuit is 2.4GHz radio communication circuit.

6. the radio energy management instrument being applicable to energy managing and control system according to claim 5, is characterized in that: described radio communication circuit comprises nRF24L01 radio frequency chip.